<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>

</head>
<body>
<!-- html代码 -->
<input type="button" value="弹窗" id="btn"/>
<script>
    document.getElementById("btn").onclick = function () {
        alert("哈哈，你别是个傻子");
    };
</script>
</body>
</html>